Embedded LED circuit board and method of manufacturing the same
A method of manufacturing an embedded LED circuit board, including the step of: forming a through hole in a circuit substrate, the through hole communicating a first surface and a second surface of the circuit substrate; embedding a LED in the through hole of the circuit substrate; and electrically connecting two pins of the LED with a circuit disposed on the second surface of the circuit substrate. Because the LED is disposed in the through hole of the circuit substrate, not disposed on the surface on the circuit substrate, the LED is embedded in the circuit substrate. Therefore, the thickness of the embedded LED circuit board is reduced and it is advantageous to assembling the embedded LED circuit board in the electronic devices having limited volume.
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The present invention relates generally to a circuit board and a method of manufacturing the same, and more particularly, to an embedded LED circuit board and a method of manufacturing the same.
2. The Prior ArtsHowever, when using the conventional method mentioned above to assemble the LED 60 to the circuit board 50, the LED 60 is projected above the top surface 52 of the circuit board 50. Due to the thickness of the LED 60, the overall thickness of the finished product increases. Therefore, it is disadvantageous to assemble the circuit board 50 having the LED 60 mounted thereon to a compact electronic device, which has a relative small inner space. As such, a method of assembling a light-emitting diode on a circuit board is desired to be provided for providing a solution in accordance with the foregoing disadvantages of the conventional design.
SUMMARY OF THE INVENTIONA primary objective of the present invention is to provide an embedded LED circuit board and a method manufacturing the same, which prevent the overall thickness of the finished product from increasing due to assembling the LED to the circuit board.
In order to achieve the foregoing objective, a method of manufacturing an embedded LED circuit board according to the present invention includes the steps of: (1) forming a through hole in a circuit substrate, the circuit substrate including a first surface and a second surface opposite to the first surface, the through hole communicating the first surface and the second surface of the circuit substrate; (2) embedding a light-emitting diode (LED) in the through hole of the circuit substrate; and (3) electrically connect two pins of the LED with a circuit disposed on the second surface of the circuit substrate.
According to the present invention, an embedded LED circuit board manufactured by the method mentioned above includes: a circuit substrate having a first surface, a second surface opposite to the first surface, a through hole formed in the circuit substrate and communicating the first surface and the second surface, and a circuit disposed on the second surface; and a LED embedded in the circuit substrate and having two pins electrically connected with the circuit disposed on the second surface of the circuit substrate.
According to the present invention, the LED is placed in the through hole after the through hole is formed in the circuit substrate. As a result, the LED is embedded in the through hole of the circuit substrate, which can reduce the increased thickness of the embedded LED circuit board due to assembling the LED with the circuit substrate. Therefore, it is advantageous to assembling the embedded LED circuit board according to the present invention in the electronic devices having limited volume.
The present invention will be apparent to those skilled in the art by reading the following detailed description of a preferred embodiment thereof, with reference to the attached drawings, in which:
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
With reference to the drawings and in particular to
Referring to
As shown in
With Reference to
Furthermore, the edges of the positive soldering point 133 and the negative soldering point 134 are aligned with the edges of the through hole 14. When the LED 20 is placed in the through hole 14 of the circuit substrate 10, a gap d is defined between the LED 20 and inner side walls of the through hole 14. The gap d allows the LED 20 to be placed in the through hole 14, but the gap d should not be too large. Because the soldering paste 15 crosses the gap d, the over-sized gap d would result in solder skip during the solidification process in the tin furnace. In order to prevent the poor soldering, the gap d according to the present invention does not exceed 1 mm.
Moreover, because the edges of the positive soldering point 133 and the negative soldering point 134 are aligned with the edges of the through hole 14, the distance between the pins 21 of the LED 20 and the positive soldering point 133 and the negative soldering point 134 is reduced. In other words, the range of printing the soldering paste 15 is reduced and thus the yield rate of the soldering in increased.
Because the LED 20 is disposed in the through hole 14 of the circuit substrate 10, not disposed on the first surface 11 of the circuit substrate 10, the LED 20 is not projected above the first surface 11 of the circuit substrate 10. And, because the circuit substrate 10 and LED 20 are partially overlapped with each other, the overall thickness of the embedded LED circuit board according to the present invention is reduced. Therefore, it is advantageous to assembling the embedded LED circuit board according to the present invention in the electronic devices having limited volume.
Referring
With Reference to
With Reference to
With Reference to
Reference 6 shows the embedded LED circuit board manufactured by the method according to the present invention. The embedded LED circuit board includes the circuit substrate 10 and the LED 20. The circuit substrate 10 includes the first surface 11 and the second surface 12 opposite to the first surface 11. The through hole 14 is formed in the circuit substrate 10 to communicate the first surface 11 and the second surface 12 of the circuit substrate 10. The LED 20 is embedded in the through hole 14 of the circuit substrate 10 and includes two pins 21 electrically connecting with the circuit 13 disposed on the second surface 12 of the circuit substrate 10. The LED 20 includes the light-emitting front side 22 and the no-light-emitting back side 23 opposite to the light-emitting front side 22. The pins 21 are disposed at the no-light-emitting back side 23 of the LED 20. According to the preferred embodiment, the pins 21 are directly disposed on a bottom of the LED 20. Solder paste 15 is deposited over the pins 21 of the LED 20 and the circuit 13 disposed on the second surface 12 of the circuit substrate 10 by printing, thereby soldering the pins 21 of the LED 20 with the circuit 13 disposed on the second surface 12 of the circuit substrate 10 together.
As shown in
The LED 20 is embedded in the circuit substrate 10 by disposing the LED 20 in the through hole 14 of the circuit substrate 10. Therefore, the overall thickness of the embedded LED circuit board is reduced, and it is advantageous to assembling the embedded LED circuit board according to the present invention in the electronic devices having limited volume.
Although the present invention has been described with reference to the preferred embodiments thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
Claims
1. A method of manufacturing an embedded LED circuit board, comprising the steps of:
- forming a through hole in a circuit substrate, the circuit substrate including a first surface and a second surface opposite to the first surface, the through hole communicating with the first surface and the second surface of the circuit substrate;
- embedding a light-emitting diode (LED) in the through hole of the circuit substrate; and
- electrically connecting two pins of the LED with a circuit disposed on the second surface of the circuit substrate;
- wherein in the step of forming the through hole in the circuit substrate, the first surface of the circuit substrate is placed on a platform with the second surface of the circuit substrate facing up, and in the step of embedding the LED in the circuit substrate, the LED includes a light-emitting front side and a no-light-emitting back side opposite to the light-emitting front side, the two pins are disposed at the no-light-emitting back side of the LED, and the LED is embedded in the through hole of the circuit substrate with the light-emitting front side facing down.
2. The method according to claim 1, wherein in the step of electrically connecting the pins of the LED with the circuit, solder paste is deposited over the pins of the LED and the circuit disposed on the second surface of the circuit substrate by printing and the solder paste is then solidified.
3. The method according to claim 2, wherein a gap is defined between the LED and inner side walls of the through hole and the gap does not exceed 1 mm.
4. An embedded LED circuit board manufactured by the method according to claim 1, the embedding LED circuit board, comprising:
- a circuit substrate including a first surface, a second surface opposite to the first surface, a through hole formed in the circuit substrate to communicate with the first surface and the second surface, and a circuit disposed on the second surface; and
- a light-emitting diode (LED) embedding in the through hole of the circuit substrate and including two pins electrically connected with the circuit disposed on the second surface of the circuit substrate.
5. The embedding LED circuit board according to claim 4, wherein a gap is defined between the LED and inner side walls of the through hole and the gap does not exceed 1 mm.
6. A method of manufacturing an embedded LED circuit board, comprising the steps of:
- forming a through hole in a circuit substrate, the circuit substrate including a first surface and a second surface opposite to the first surface, the through hole communicating with the first surface and the second surface of the circuit substrate;
- embedding a light-emitting diode (LED) in the through hole of the circuit substrate; and
- electrically connecting two pins of the LED with a circuit disposed on the second surface of the circuit substrate;
- wherein in the step of forming the through hole in the circuit substrate, the second surface of the circuit substrate is placed on a platform with the first surface of the circuit substrate facing up;
- in the step of embedding the LED in the circuit substrate, the LED includes a light-emitting front side and a no-light-emitting back side opposite to the light-emitting front side, the two pins are disposed at the no-light-emitting back side of the LED, and the LED is embedded in the through hole of the circuit substrate with the light-emitting front side facing up; and
- after embedding the LED in the through hole of the circuit substrate, a cover plate is placed over the first surface of the circuit substrate, and the circuit substrate and the cover plate are simultaneously flipped over to make the second surface of the circuit substrate facing up.
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Type: Grant
Filed: Mar 4, 2016
Date of Patent: Aug 28, 2018
Patent Publication Number: 20180040762
Assignee: LONGMEN GETMORE POLYURETHANE CO., LTD. (Guangdong)
Inventor: Chia-Yen Lin (Huizhou)
Primary Examiner: Mohsen Ahmadi
Assistant Examiner: Gustavo Ramallo
Application Number: 15/549,203
International Classification: H01L 33/62 (20100101); H01L 33/48 (20100101); H01L 33/00 (20100101); H05K 1/18 (20060101); H05K 3/30 (20060101); H05K 3/32 (20060101);